import type { CorrelationId, EffectOutcome, EffectRequest, SemanticEvent } from "../protocol.js";
export type EmailAddress = string & {
    readonly __emailAddress: unique symbol;
};
export type State = {
    readonly kind: "Empty";
    readonly version: number;
} | {
    readonly kind: "Editing";
    readonly email: string;
    readonly version: number;
} | {
    readonly kind: "Invalid";
    readonly email: string;
    readonly reason: string;
    readonly version: number;
} | {
    readonly kind: "Checking";
    readonly email: EmailAddress;
    readonly correlationId: CorrelationId;
    readonly version: number;
} | {
    readonly kind: "Available";
    readonly email: EmailAddress;
    readonly version: number;
} | {
    readonly kind: "Unavailable";
    readonly email: EmailAddress;
    readonly version: number;
} | {
    readonly kind: "CheckFailed";
    readonly email: EmailAddress;
    readonly retryable: boolean;
    readonly version: number;
} | {
    readonly kind: "OutcomeUnknown";
    readonly email: EmailAddress;
    readonly obligation: "ReconcileAvailability";
    readonly version: number;
};
export type Command = {
    readonly kind: "CommitEmail";
    readonly value: string;
} | {
    readonly kind: "CheckAvailability";
    readonly capability: "Http";
    readonly correlationId: CorrelationId;
} | {
    readonly kind: "RecordAvailability";
    readonly correlationId: CorrelationId;
    readonly outcome: EffectOutcome;
};
export type TransitionError = {
    readonly kind: "IllegalFromCurrentState";
} | {
    readonly kind: "StaleEffectResult";
} | {
    readonly kind: "InvalidEmail";
    readonly reason: string;
};
export type TransitionResult = {
    readonly accepted: true;
    readonly state: State;
    readonly effects: readonly EffectRequest[];
} | {
    readonly accepted: false;
    readonly state: State;
    readonly error: TransitionError;
};
export declare const initialState: () => State;
export declare function decodeEmail(value: string): EmailAddress | null;
export declare function eventToCommand(event: SemanticEvent, correlationId: CorrelationId): Command;
export declare function transition(state: State, command: Command): TransitionResult;
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